#include<stdio.h>
#include<unistd.h>
#include <sys/types.h>

int num = 0;

int main()
{
    pid_t id = fork();
    if(id > 0)
    {
        while(1)
        {
            printf("我是父进程，PID: %d, PPID：%d, num：%d\n",getpid(), getppid(), num++);
            sleep(1);
        }
    }
    else if(id == 0)
    {
        while(1)
        {
            printf("我是子进程，PID：%d, PPID：%d,  num：%d\n",getpid(),getppid(),  num);
            sleep(1);
        }
    }
   //while(1)
   //{
   //printf("I am a process, pid: %d,ppid: %d\n",getpid(),getppid());
   //sleep(1);
   //}
    //printf("I am a process, pid: %d,ppid: %d",getpid(),getppid());
    //sleep(10);
    
    return 0;
}
